<template>
  <div class="com-b">
    <h1>B组件</h1>
    <button @click="fn">B传值A</button>
  </div>
</template>

<script>
import eventBus from '@/eventBus'
export default {
  name: 'com-b',
  data () {
    return {
      msg: 'com-b组件数据'
    }
  },
  methods: {
    fn () {
      // 传递数据
      eventBus.$emit('b2a', this.msg)
    }
  }
}
</script>
